The separation and determination of very small amounts of aluminium and iron in water

Strafford, N.; Wyatt, P. F.

doi:10.1039/an943680319b

Cited by 18 publications

(3 citation statements)

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“…The method of analysis outlined above is essentially that of Houghton (1943), with modifications proposed by Strafford & Wyatt (1943), and further altered to adapt it to analysis of spray deposits. Waterhouse (1947) has summarized the evidence, showing that it is desirable to reduce the 'mean free flight' of flying insects during a biossay to a low level.…”

Section: A B P P a G E A S T R I N G E R A N D R E B L A C K mentioning

confidence: 99%

BIOASSAY SYSTEMS FOR THE PYRETHRINS I. WATER‐BASE SPRAYS AGAINST AXDËS AEGYPTI L. AND OTHER FLYING INSECTS

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Stringer

Blackith

1949

Annals of Applied Biology

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A bioassay system for the pyrethrins is discussed in which the quantity of toxicant that flying insects accumulate is measured, as well as the responses of the insects. T h e determination of spray pick-up from water-base sprays is described, and the use of primary responses, such as activation and paralysis, in biological assays is advocated. T h e test system is discussed in detail for Aedes aegypti L. and the special characteristics of some other species of flying insects noted. I t is considered that the location of the site of action of the pyrethrins under these conditions is at the peripheral nervous system of the test insects. WATER-BASE SPRAYS AND AIDES AEGYPTI L. Relation between toxicity and pick-up of insecticides applied as aqueous spraysMuch published work has been based on the tacit assumption that the quantity of insecticide accumulated by an insect flying in a spray is proportional to the concentration of insecticide in the spray fluid and to the volume sprayed into the air space occupied by the insects. Published statements that wasps, horseflies and blowflies are more sensitive than houseflies to pyrethrins, based on the concentrations used, ignore the fact that the first-mentioned insects, which are hairy, pick up far more spray liquid in flight or when stationary than the houseflies. We have shown that the weight of insecticide acting on the insect is proportional to the product of the volume of spray liquid accumulated by the insect and the concentration of insecticide in the liquid.If the volume of liquid picked up by the insect is plotted against the concentration of insecticide in the spray liquid, the points representing the acquisition of a constant quantity of insecticide by the insect should then lie on arectangular hyperbola. This has been shown to be true for a number of insects, using their responses to the weights of pyrethrins accumulated. Any variation of the conditions which alters the quantity of spray liquid accumulated, such as a change of nominal spray dosage, or humidity, also alters the concentration at which any particular response occurs and alters it in such a way that the threshold weight of the insecticide causing the response is maintained.

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Section: A B P P a G E A S T R I N G E R A N D R E B L A C K mentioning

confidence: 99%

BIOASSAY SYSTEMS FOR THE PYRETHRINS I. WATER‐BASE SPRAYS AGAINST AXDËS AEGYPTI L. AND OTHER FLYING INSECTS

Page

Stringer

Blackith

1949

Annals of Applied Biology

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“…As with silica, the colorimetric determination of aluminum is more rapid and apparently more accurate for low concentration than gravimetric methods. Strafford and Wyatt (129) found it desirable to have a method for determining 0.005 to 0.1 p.p.m. of aluminum in treated water.…”

Section: Aluminum and Ironmentioning

confidence: 99%

Water Analysis

Love¹

1949

Anal. Chem.

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“…, Samples of this same suspension and of its clear supernatant liquor were acidified and analyzed for total aluminum content by the hacmatoxydin method (17). The determination gave: By these analyses, the aluminum in the alumina floe amounts to 11 mg. per liter.…”

Section: Manymentioning

confidence: 99%

Composition of Rosin Size Precipitate

Price¹

1947

Ind. Eng. Chem.

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The separation and determination of very small amounts of aluminium and iron in water

Cited by 18 publications

References 0 publications

BIOASSAY SYSTEMS FOR THE PYRETHRINS I. WATER‐BASE SPRAYS AGAINST AXDËS AEGYPTI L. AND OTHER FLYING INSECTS

BIOASSAY SYSTEMS FOR THE PYRETHRINS I. WATER‐BASE SPRAYS AGAINST AXDËS AEGYPTI L. AND OTHER FLYING INSECTS

Water Analysis

Composition of Rosin Size Precipitate

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